The main differences between ternary lithium batteries and lithium iron phosphate batteries are as follows:
Energy density: The energy density of ternary lithium batteries is about 200 Wh /kg, while the energy density of ternary lithium batteries is around 200 Wh/kg. Lithium iron phosphate batteries The density is approximately 110Wh/kg. Therefore, with the same weight, ternary lithium batteries can store more electrical energy, which extends the battery life.
Safety performance: Since the cathode material of the ternary lithium battery contains elements such as nickel and cobalt, if overcharged or overdischarged, these elements may cause the release of oxygen and volatilization of the cathode material, causing it to fire or explode. However, the cathode material of lithium iron phosphate batteries does not containdoes not contain volatile elements, so it has higher thermal stability and overload resistance, resulting in higher safety.
Temperature Resistance: Ternary lithium batteries perform best in low temperature environments. For example, at minus 20°C they can release 70.14% of their capacity. In comparison, lithium iron phosphate batteries perform better under the same conditions. terms. Only 54.94% of the capacity can be released. However, in high temperature environments, lithium iron phosphate batteries have a longer service life and their capacity attenuation is relatively low.
This is not recommended.
This will affect battery life.
The charging capacities of lithium batteries are as follows:
1. Before solving the problem, we must first understand the structure and prprinciple of operation of the lithium iron phosphate battery used. like the positive electrode of the battery, which is made of aluminum foil and the positive electrode of the battery is connected, and in the middle is a polymer separator, which separates the positive electrode from the negative electrode, but lithium ions can pass but electrons cannot. On the right is the negative electrode of the battery made of carbon (graphite), which is connected to the negative electrode of the battery by a copper foil. Between the upper and lower ends of the battery is the battery electrolyte, and the battery is sealed by a metal casing. When a lithium iron phosphate battery is charged, lithium ions from the positive electrode migrate to the negative electrode through the polymer separator; During the discharge process, lithium ions from the negative electrode migrate to the positive electrode through thee separator; Lithium-ion batteries get their name because lithium ions migrate back and forth during charging and discharging.
2. When the battery is charging, lithium ions migrate from the surface of the lithium iron phosphate crystal to the crystal surface, under the action of the electric field force, they enter the electrolyte and pass through. The separator then migrate to the graphite crystal through the electrolyte surface, then integrated into the graphite network. At the same time, electrons flow to the aluminum foil collector of the positive electrode through the conductor, flow to the copper foil collector of the negative electrode through the tab, the battery pole , the external circuit, the negative pole and the tab, then flow to the negative graphite electrode through the conductor. The charge on the negative electrode is balanced. Once the lithium ions are disintegratedrcalated from lithium iron phosphate, lithium iron phosphate is converted to iron phosphate.
3. When the battery is discharged, the lithium ions are deintercalated from the graphite crystal, enter the electrolyte, pass through the separator, then migrate to the surface of the lithium iron phosphate crystal through the electrolyte, and then reintegrated into the lithium iron phosphate crystal through the surface of the lithium iron phosphate crystal lattice. At the same time, the battery flows to the negative electrode copper foil collector through the conductor, flows to the battery positive electrode aluminum foil collector through the tab, the negative pole of the battery, the external circuit, the positive pole and the positive. tab, then flows to the iron phosphate through the conductor. The positive lithium electrode makes the positive. The polar charges reach equilibrium.